387222509 has 4 divisors (see below), whose sum is σ = 387267804. Its totient is φ = 387177216.

The previous prime is 387222499. The next prime is 387222523. The reversal of 387222509 is 905222783.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 297390025 + 89832484 = 17245^2 + 9478^2 .

It is a cyclic number.

It is not a de Polignac number, because 387222509 - 2¹² = 387218413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387222559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5492 + ... + 28365.

It is an arithmetic number, because the mean of its divisors is an integer number (96816951).

Almost surely, 2^387222509 is an apocalyptic number.

It is an amenable number.

387222509 is a deficient number, since it is larger than the sum of its proper divisors (45295).

387222509 is a wasteful number, since it uses less digits than its factorization.

387222509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45294.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 387222509 is about 19677.9701443010. The cubic root of 387222509 is about 728.8758007420.

The spelling of 387222509 in words is "three hundred eighty-seven million, two hundred twenty-two thousand, five hundred nine".